diff --git a/build.py b/build.py
index 80441a6121..ed7b7a4b14 100755
--- a/build.py
+++ b/build.py
@@ -270,6 +270,7 @@ def examples_star_json(name, match):
           "exports": [],
           "src": [
             "src/**/*.js",
+            "build/ol.ext/*.js",
             "examples/%(id)s.js" % match.groupdict()],
           "compile": {
             "js": [
diff --git a/config/examples-all.json b/config/examples-all.json
index b3983b9673..f5b300e3ca 100644
--- a/config/examples-all.json
+++ b/config/examples-all.json
@@ -2,6 +2,7 @@
   "exports": [],
   "src": [
     "src/**/*.js",
+    "build/ol.ext/*.js",
     "build/examples/all.js"
   ],
   "compile": {
diff --git a/package.json b/package.json
index 5190d9467c..33c143b78f 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,7 @@
   ],
   "homepage": "http://openlayers.org/",
   "scripts": {
-    "install": "node tasks/parse-examples.js",
+    "install": "node tasks/install.js",
     "postinstall": "closure-util update",
     "start": "node tasks/serve.js",
     "test": "node tasks/test.js"
diff --git a/tasks/build-ext.js b/tasks/build-ext.js
index 70e4aaf2f7..a6cb6b3b92 100644
--- a/tasks/build-ext.js
+++ b/tasks/build-ext.js
@@ -71,9 +71,17 @@ function buildModules(modules, callback) {
 }
 
 
-if (require.main === module) {
+/**
+ * Build all external modules.
+ * @param {function(Error)} callback Called with any error.
+ */
+function main(callback) {
   var modules = getExternalModules();
-  buildModules(modules, function(err) {
+  buildModules(modules, callback);
+}
+
+if (require.main === module) {
+  main(function(err) {
     if (err) {
       process.stderr.write(err.message + '\n');
       process.exit(1);
@@ -82,3 +90,5 @@ if (require.main === module) {
     }
   });
 }
+
+module.exports = main;
diff --git a/tasks/build.js b/tasks/build.js
index dd07d343cf..3f4fe2e2cf 100644
--- a/tasks/build.js
+++ b/tasks/build.js
@@ -127,7 +127,7 @@ function getDependencies(config, exports, callback) {
       };
     } else {
       options = {
-        lib: ['src/**/*.js'],
+        lib: ['src/**/*.js', 'build/ol.ext/*.js'],
         cwd: root
       };
     }
diff --git a/tasks/install.js b/tasks/install.js
new file mode 100644
index 0000000000..52cce80f8f
--- /dev/null
+++ b/tasks/install.js
@@ -0,0 +1,17 @@
+var async = require('async');
+
+var buildExt = require('./build-ext');
+var parseExamples = require('./parse-examples');
+
+/**
+ * Parse examples and build external modules.
+ */
+async.waterfall([
+  parseExamples,
+  buildExt
+], function(err) {
+  if (err) {
+    process.stderr.write(err + '\n');
+    process.exit(1);
+  }
+});
diff --git a/tasks/parse-examples.js b/tasks/parse-examples.js
index 09e86c1b64..8315da6716 100644
--- a/tasks/parse-examples.js
+++ b/tasks/parse-examples.js
@@ -137,14 +137,25 @@ function writeExampleList(exampleInfos, callback) {
 
 /**
  * List examples, parse them, and write example list.
+ * @param {function(Error)} callback Called with any error.
  */
-async.waterfall([
-  listExamples,
-  parseExamples,
-  writeExampleList
-], function(err) {
-  if (err) {
-    process.stderr.write(err + '\n');
-    process.exit(1);
-  }
-});
+function main(callback) {
+  async.waterfall([
+    listExamples,
+    parseExamples,
+    writeExampleList
+  ], callback);
+}
+
+if (require.main === module) {
+  main(function(err) {
+    if (err) {
+      process.stderr.write(err.message + '\n');
+      process.exit(1);
+    } else {
+      process.exit(0);
+    }
+  });
+}
+
+module.exports = main;
diff --git a/tasks/serve.js b/tasks/serve.js
index 219ce69a5f..a7f792d51b 100644
--- a/tasks/serve.js
+++ b/tasks/serve.js
@@ -22,6 +22,7 @@ var createServer = exports.createServer = function(callback) {
   var manager = new closure.Manager({
     lib: [
       'src/**/*.js',
+      'build/ol.ext/*.js',
       'test/spec/**/*.test.js'
     ],
     main: 'examples/*.js'